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Segments - Summary of Product Categories as Percent of Net Sales (Detail) - Sales Revenue [Member] - Product Concentration Risk [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Figures [Member]      
Schedule of Property and Equipment Net by Country [Line Items]      
Percent of sales 81.60% 81.80% 82.00%
Other [Member]      
Schedule of Property and Equipment Net by Country [Line Items]      
Percent of sales 18.40% 18.20% 18.00%